Fink: THE LICHENS OF MINNESOTA. 697 



28 Peltigera canina (L.) Hopfm. var. sorediata Sch.er. 



On earth. Big island, July, 1894, no. 2210. 



This plant was often observed by the writer at Minne 

 apolis, where it frequently fruits, as does the plant here 

 listed from the Lake of the Woods. It is rare and usu- 

 ally sterile in Iowa. The plant is nearly as fibrillose 

 beneath as Peltigera canina (L.) Hopfm., with shorter 

 always white fibrils, those of the latter frequently be- 

 coming brown. 



Not previously reported from Minnesota. 



29. Collema crispum Borr. 



On earth. American islands, July, 1896, no 22. 

 The margins of the apothecia are crenate, in which the 

 plant is nearer Collema tenax (Sw.) Ach. 

 Not previously reported from Minnesota. 



30. Placodium elegans (Link.) D. C. 



On granitic rocks. American islands, July, 1896. no. 56 



31. Placodium cerinum (Hedw.) Naeg. and Hepp. 



On trees. American islands, July, 1896, nos. 8 and 16. 



32. Placodium vitellinum (Ehrh.) Naeg. and Hepp. 



On granitic rocks. American islands, July, 1896, no. 55. 



Spores 20 to 30 in asci. Thallus rather deficient, and 

 some of the apothecia have entire margins. In the last 

 two characters the plant approaches var. ait vellum Ach. 



Not previously reported from Minnesota. 



33. Lecanora rubina (Vill.) Ach. 



On granitic rocks. American islands, July, 1896, no. 57. 

 Not previously reported from Minnesota. 



34. Lecanora varia (Ehrh.) Nyl. 



On granitic rocks. American islands, July, 1896, no. 52. 

 Not previously reported from Minnesota. 



35. Lecanora varia (Ehrh.) Nyl, var. symmicta Ach. 



On dead wood. American islands, July, 1894, no. 2273c. 

 American islands, July, 1896, no. 29. 



The spores are not so wide in proportion to the length 

 as Tuckerman's measurements, as is frequently the case 

 with specimens of various forms of the species from Min- 

 nesota and Iowa. 



Not previously re\ 3d from Minnesota. 



